def raDecToAltAz(raDec, latitude, lst):
decR = CoordUtil.coordToR(raDec.dec)
latR = CoordUtil.coordToR(latitude)
ha = CoordUtil.raToHa(raDec.ra, lst)
haR = CoordUtil.coordToR(ha)
altR,azR = CoordUtil.coordRotate(decR, latR, haR)
return Position.fromAltAz(Coord.fromR(CoordUtil.makeValid180to180(altR)), Coord.fromR(CoordUtil.makeValid0to360(azR)))
def __init__(self, buffer):
# discard time
buffer.recv(8)
self.ra = struct.unpack("<1I", buffer.recv(4))[0]
self.ra *= (math.pi / 0x80000000)
self.ra = Coord.fromR(self.ra).toHMS()
self.dec = struct.unpack("<1i", buffer.recv(4))[0]
self.dec *= (math.pi / 0x80000000)
self.dec = Coord.fromR(self.dec).toDMS()
self.position = Position.fromRaDec(self.ra, self.dec)
def precess(self, epoch=Epoch.NOW):
if str(epoch).lower() == str(Epoch.J2000).lower():
epoch = ephem.J2000
elif str(epoch).lower() == str(Epoch.B1950).lower():
epoch = ephem.B1950
elif str(epoch).lower() == str(Epoch.NOW).lower():
epoch = ephem.now()
j2000 = self.toEphem()
now = ephem.Equatorial(j2000, epoch=epoch)
return Position.fromRaDec(Coord.fromR(now.ra), Coord.fromR(now.dec), epoch=Epoch.NOW)
def LST(self):
"""
Mean Local Sidereal Time
"""
#lst = self._getEphem(self.ut()).sidereal_time()
#required since a Coord cannot be constructed from an Ephem.Angle
lst_c = Coord.fromR(self.LST_inRads())
return lst_c.toHMS()
def LST (self):
"""
Mean Local Sidereal Time
"""
#lst = self._getEphem(self.ut()).sidereal_time()
#required since a Coord cannot be constructed from an Ephem.Angle
lst_c = Coord.fromR(self.LST_inRads())
return lst_c.toHMS()
def angsep(self, other):
"""
Calculate the Great Circle Distance from other.
@param other: position to calculate distance from.
@type other: L{Position}
@returns: The distance from this point to L{other}.
@rtype: L{Coord} in degress (convertable, as this is a Coord).
"""
return Coord.fromR(CoordUtil.gcdist(self.R, other.R)).toD()
def angsep(self, other):
"""
Calculate the Great Circle Distance from other.
@param other: position to calculate distance from.
@type other: L{Position}
@returns: The distance from this point to L{other}.
@rtype: L{Coord} in degress (convertable, as this is a Coord).
"""
return Coord.fromR(CoordUtil.gcdist(self.R, other.R)).toD()
def toEpoch(self, epoch=Epoch.J2000):
'''
Returns a new Coordinate with the specified Epoch
'''
# If coordinate epoch is already the right one, do nothing
if str(epoch).lower() == str(self.epoch).lower():
return self
# Else, do the coordinate conversion...
if str(epoch).lower() == str(Epoch.J2000).lower():
eph_epoch = ephem.J2000
elif str(epoch).lower() == str(Epoch.B1950).lower():
eph_epoch = ephem.B1950
elif str(epoch).lower() == str(Epoch.NOW).lower():
eph_epoch = ephem.now()
coords = ephem.Equatorial(self.toEphem(), epoch=eph_epoch)
return Position.fromRaDec(Coord.fromR(coords.ra), Coord.fromR(coords.dec), epoch=epoch)
def toEpoch(self, epoch=Epoch.J2000):
'''
Returns a new Coordinate with the specified Epoch
'''
# If coordinate epoch is already the right one, do nothing
if str(epoch).lower() == str(self.epoch).lower():
return self
# Else, do the coordinate conversion...
if str(epoch).lower() == str(Epoch.J2000).lower():
eph_epoch = ephem.J2000
elif str(epoch).lower() == str(Epoch.B1950).lower():
eph_epoch = ephem.B1950
elif str(epoch).lower() == str(Epoch.NOW).lower():
eph_epoch = ephem.now()
coords = ephem.Equatorial(self.toEphem(), epoch=eph_epoch)
return Position.fromRaDec(Coord.fromR(coords.ra),
Coord.fromR(coords.dec),
epoch=epoch)
def moonpos(self, date=None):
date = date or self.localtime()
self._moon.compute(self._getEphem(date))
return Position.fromAltAz(Coord.fromR(self._moon.alt),
Coord.fromR(self._moon.az))
def moonpos(self, date=None):
date = date or self.localtime()
self._moon.compute(self._getEphem(date))
return Position.fromAltAz(
Coord.fromR(self._moon.alt), Coord.fromR(self._moon.az))
def sunpos(self, date=None):
date = date or self.ut()
self._sun.compute(self._getEphem(date))
return Position.fromAltAz(
Coord.fromR(self._sun.alt), Coord.fromR(self._sun.az))
def getCurrentTrackingRate(self):
raTrack = Coord.fromH(self._telescope.dRaTrackingRate)
decTrack = Coord.fromR(self._telescope.dDecTrackingRate)
return (raTrack.toHMS(), decTrack.toDMS())
def sunpos(self, date=None):
date = date or self.ut()
self._sun.compute(self._getEphem(date))
return Position.fromAltAz(Coord.fromR(self._sun.alt),
Coord.fromR(self._sun.az))
def __init__(self):
self._table = np.loadtxt('%s/data/dome_model.csv' % os.path.dirname(chimera_lna.__file__), delimiter=',')
self._coordinates = [[Position.fromAltAz(Coord.fromR(v[0]), Coord.fromR(v[1])), v[2]] for v in self._table]
